The PCS help written in November 1993 lists just 2 people from Pyrodex on the PC, Bartman and Dexter.

A pyrodex.nfo for a Nov 1998 CD crack for Half-Life lists the members as:

El Barto (cracker), The Fly (cracker), Prof .X (cracker).

They used to have the website, pyrodex.home.ml.org that redirected to i.am/pyrodex.